FBI says it’s not the source of the UDIDs in Antisec’s leak

Earlier today, hacker group AntiSec claimed to have stolen 12 million UDIDs that belong to iOS device owners in the US. The group allegedly stole the unique identifiers when it hacked the laptop of an FBI employee. In response to this allegation, the FBI released a statement to the media that claims the government agency is not the source of the leak.

The FBI is aware of published reports alleging that an FBI laptop was compromised and private data regarding Apple UDIDs was exposed. At this time there is no evidence indicating that an FBI laptop was compromised or that the FBI either sought or obtained this data.

It’s not surprising that the FBI would deny the allegations, but suppose this statement is true and the FBI is not the source, then where did these UDIDs come from?